Bash Script verify user input is not empty and is equal to a value Post: 302389995

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Top Forums Shell Programming and Scripting Bash Script verify user input is not empty and is equal to a value Post 302389995 by spartiati on Tuesday 26th of January 2010 02:49:59 PM

01-26-2010

Registered User

Bash Script verify user input is not empty and is equal to a value

I need to create a script that has a user enter a value. I want to verify that the value is either 1,2, or 3. If it is not then I want them to try entering it again. I am using a while loop to force them to retry.

I am able to test the input against 1,2, and 3, but when I test agains an empty variable, I get an error (expected unary). Below is what I have so far:

Code:

echo
echo "Which item?"
echo "1) choice 1"
echo "2) choice 2"
echo "3) choice 3"
echo
echo "Enter Choice:"
read -e INPUT
echo
while [ $INPUT != 1 ] && [ $INPUT != 2 ] && [ $INPUT != 3 ] && [ $COUNTER -lt 5 ] || [ -z $INPUT ]; do
        clear
        echo
        echo "You did not enter an appropriate choice.  Please enter 1, 2, or 3."
        echo "1) choice 1"
        echo "2) choice 2"
        echo "3) choice 3"
        echo
        echo "Enter Choice:"
        read -e INPUT
        echo
        let COUNTER++
        echo "Counter =$COUNTER"
done
# PROVIDER VARIABLES
case $INPUT in
1)
        PROV_POOL="choice1";;
2)
        PROV_POOL="choice 2";;
3)
        PROV_POOL="choice 3";;
*)
        STATUS=1
esac
if [ $STATUS == 0 ]
then
        echo "You entered a good value"
else
        echo "You have exceeded the error retry count."
fi

Last edited by pludi; 01-26-2010 at 03:55 PM.. Reason: code tags, please...

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LEARN ABOUT OSF1

grpck

pwck(8) 						      System Manager's Manual							   pwck(8)

NAME

       pwck, grpck - Checks the password and group files for inconsistencies

SYNOPSIS

       pwck [-admNs] [file]

       grpck [-mNp] [file]

FLAGS

       Causes  both pwck and grpck to additionally check the NIS database entries using the same consistency tests.  Users that are defined in the
       local password or group file without the "+" at the start of the name field are flagged as duplicate entries.

   pwck
       Inhibits the running of the /tcb/bin/authck -p command on a system running Enhanced Security.  Prevents pwck from checking for the presence
       of  the	user's	login  directory.   Directs pwck to check for mixed case usernames.  Causes pwck to check for the presence of the optional
       shell field for each entry.

   grck
       If there are no members, causes grpck to display a message indicating the listed group has no members.  Directs grpck to not  check  for  a
       users' existence in the password database (local or NIS).

DESCRIPTION

       The pwck command scans the /etc/passwd file, or the named file, and writes to standard out any inconsistencies.	The scan checks the number
       of fields, login name, user ID, group ID, and existence of a login directory and optional program name.

       The grpck command scans the /etc/group file, or the named file, and writes to standard out any inconsistencies.	The scan checks the number
       of fields, group name, group ID, and whether all login names appear in the password file.

EXAMPLES

       To verify the password information in the /etc/passwd file for consistency, enter: pwck

       To verify the password information in the /etc/passwd file and the NIS database for consistency without checking each users login directory
       validity, enter: pwck -Nd

       To verify the group information in the /etc/group file and the NIS database for consistency, enter: grpck -N

FILES

       Specifies the command path Specifies the command path Contains user information Contains group information

RELATED INFORMATION

       Commands:  adduser(8), authck(8), groups(1), passwd(1), vipw(8)

       Files:  passwd(4), group(4), ypfiles(4) delim off

																	   pwck(8)

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